Plier wrench



P. F. KING.

IPLIER WRENCH. APPLICATION FILED MAY 18. 1921.

Patented Feb. 7, 1922.

UNITED STATES PATENT OFFICE.

ILIER WRENCH.

Specification of Letters Patent.

Patented Feb. 7, 1922.

Application filed May 18, 1921. Serial No. 470,713.

Toall whom it ma concern: 7

Be it known t at I, P-nRoivAn F. KING, a citizen of the Dominion of Canada, residing at Shreveport, in the parish of Caddo and State of Louisiana, have invented certain new and useful Improvements in Plier \Vrenches, of which the following is a specification. r This invention has for an object to provide an inexpensive, quick aidjustlng, positive grip wrench of the plier type and in its general nature it comprises "a pair of handle levers pivoted together, one. of the levers carrying a sling in which one jaw of the wrench is pivoted, the jaw which is pivoted in the sling being of bell crank form and having its arm projected through a slot in the opposite jaw, the arm and the opposing face of the opposite jaw being saw toothed to effect a tight engagement or grip between the parts when the wrench is applied =to a nut; the jaw which opposes'the bell-crank-j aw is pivoted to the other handle lever and projects through the sling.

In its more detailed nature, the invention also resides in those novel features of construction, combination and arrangement of parts, all of which will be first fully described and then be specifically pointed out in the appended claims, reference being had to the accompanying drawings, in which:

Figure 1 is a side elevation of the tool, a part being broken away.

Figure 2 is a similar view of the tool showing it applied to'a nut.

Figure 3 is a detail perspectlve view of the bell crank aw.

Figure 4 is a detail perspective view of the opposite jaw. v V Figure 5 is 'adetail perspective view of the sling.

Figure 6 is a vertical section on the line 6-6 of Figure 2.

In the drawings in which like numerals and letters of reference designate like parts in all of the Figures, 1 and 2 represent the handle members which are pivoted together at 3.

4 indicates the sling which is pivoted at 5 to "the handle member 1 and in which at 8 is pivoted the bell crank jaw 6, the latter having a shoulder 7 to engage the loop of the sling 4 as a stop for a purpose presently explained.

9 is the arm of the bell crank jaw, 6, the

front face 15 of which is serrated or saw toothed to engage the saw toothed face 14 of the opposite jaw 10 through a slot 13 in which the arm 9 projects.

The jaw 10 is split at. 11 to form lugs through which the same is pivoted at 12 to the handle 2, the connection being such as to enable the jaw 10 to be raised clear of the nut and disengaged from the arm of the opposing jaw when the handles are separated. The jaw has shoulders 16 to engage a shoulder 17 of the handle 2 and it is rounded at 18 so as to form a one way' hinge connection with the handle.

The front face 19 of the sling is curved inwardly, as best shown in Figures 1, 2 and 5, so as to insure increased ease in the ad- Vance of the jaw 10 towards its closing point and it causes a parallel encounter of the teeth contained in the arm 9 of the bell crank jaw 6 with the teeth 14 of the jaw 10 so that when the jaws are engaged and pressure forces the arm 9 of the bell crank jaw towards the teeth 14, it strikes the teeth in the aw 10 equally. It will also be noted that the saw teeth 15 an 14 are one way teeth only, thus greatly increasing the looking quality. It will also be noted that the saw teeth 14 of-the jaw 10 are removed at 21 to present a smooth surface to the teeth 15 at that place, whereby when the jaw 10 is being released, the smooth surface will act as a fulcrum against the arm 9 to assist in releasing the teeth 14 from engagement with the teeth 15, thus making it easier to disengage the teeth when the Wrench is easily locked than would be the case were the teeth 14 extended the entire length of the face of the slot 13.

In use the tool is applied to a nut in the manner indicated in Figure '2 and as the handles are squeezed together, the pivots 5 and 12 are separated to bring the jaw 6 up to the nut and throw the arm 9 over into engagement with the saw toothed face 114 of the jaw 10 which lies on top of the nut 6, securing the jaws 6 and 10 together and preventing slipping as long as pressure is applied to the handles 1 and 2 to squeeze them together.

'When pressure is released on the handles and they are separated, the shoulder 7 by its engagement with the sling 4 holds the arm 9 from following over toward the saw toothed face 14 of the jaw 10 as that jaw is lifted and swung forwardly on the. nut to handle 2, by pressing forward the handle 2,]

' it tends to bend the connection between the aw and the handle at 12 upwardly at the back ofthe jaw, thus lifting the jaw freely from engagement with the teeth 15. The absence of teeth at 21 serves to prevent resistance, when the jaw is released.

From the foregoing, it will be seen that I have provided a simple, inexpensive,

quick adjustable, positive grip tool for the purposes described, which is composed of only five principal parts and can be manufactured at a minimum expense.

From the foregoing description, taken in connection with the accompanying drawings, it is thought the complete construction, operation and advantages of my invention will be readily understood by those skilled in the art.

What I claim is:

1. A plier wrench comprising a pair of handle levers pivoted together, a sling carried by one of said levers, a jaw pivoted in the sling, another jaw pivoted to the other lever, and means for interlocking said jaws when pressure is applied to the levers to move them in one direction.

2. A tool of the character stated comprising a pair of handle levers pivoted together,

" a sling pivotally suspended from one lever,

a bell crank jaw pivoted in said sling, a second jaw ivoted to the other lever and projecting through the sling, said other jaw having a slot, said bell crank lever including an arm projecting through said slot, said arm and said slot having opposing saw toothed faces.

3. A tool of the character stated comprising a pair of handle levers pivoted together, a sling pivotally suspended from one lever, a bell crank jaw pivoted in said sling, a second jaw pivoted to the other lever, said other jaw having a slot, said bell crank lever including an arm projecting through said slot, said arm and said slot having opposing saw toothed faces, said bell crank lever having a shoulder to engage said sling to limit its pivotal movement in one direction. 4. A plier wrench comprising a pair of handle levers pivoted together, a sling carried by one of said levers, a jaw pivoted in the sling, another jaw pivoted to the other lever, means for limiting the pivotal movement of said other jaw in one direction, and means for interlocking said jaws when pressure is applied to the levers to move them in onedirection.

5. A plier wrench comprising a pair of handle levers pivoted together, a sling carried by one of said levers, a jaw pivoted in the sling, another aw connected to the other lever by a one way h nge connectlon, and

means for interlocking the said jaws when.

having its front face concaved in the direction of its length.

7. A plier wrench 'comprisinga pair of handle levers pivoted together, a sling pivoted to one of said levers, a jaw hinged to the other of said levers with a one way hinge joint, said jaw having a slot through which said sling passes, another jaw pivotally carried in said sling and'having an arm projected through said slot of said first mentioned'jaw, said first mentioned jaw and said arm having interlocking teeth, said sling having its front face concaved in the direction of its length, and said first mentioned jaw saw teeth extendingonly a part of the depth of the slot to leave a smooth fulcrum surface in releasing the jaws.

8. A plier wrench comprising a pair of handle levers pivoted together, a sling carried by one of said levers, a jaw pivoted in the sling, another jaw carried by-the other lever, means for interlocking said jaws, when pressure is applied to the levers, to movethem in one d rection and means for unlockarm having interlocking teeth, said sling having its front face concaved in the direction of its length, and said first mentioned jaw saw teeth extending only a part of the depth of the slot to leavea smooth fulcrum' surface in releasing the jaws, said one way hinge joint connection between said jaw and its lever having provision whereby when said handle levers are moved to release said jaws said hinge jaw will have its back tooth portion raised to disengage said arm.

PERCIVAL FAULKNER KING. 

